a 2.0+ghz i3 and 4gb ram baseline with some sort of nvidia gpu for $899 would be nice. perhaps with a backlit too, while still even keeping the plastic body.
i think it would be cool to have something like getting rid of the current macbook, renaming the 13'' macbook pro to simply a macbook, and having the 15'' and 17'' with the name "macbook pro," as they are more powerful computers. all of which have a backlit keyboard and aluminum unibody.
so either a solid value plastic mb (i3/4gb/nvidia/320gb 5400rpm at $899, roughly) or get rid of it altogether and make the 13'' mbp the "macbook."
just some ideas.